Amy Huang via llvm-dev
2019-Jul-18 21:42 UTC
[llvm-dev] [RFC] Changing X86 data layout for address spaces
I'm working on implementing MSVC's __ptr32, __ptr64, __sptr, and __uptr extensions, which represent native pointers on 32-bit and 64-bit systems. The implementation involves adding three address spaces that represent - 32-bit pointers with sign extension, - 32-bit pointers with zero extension, and - 64-bit pointers. This would require adding the three pointer sizes '-p253:32:32-p254:32:32-p255:64:64' to the X86 datalayout. I picked 253/254/255 because they're close to 256-258, which are the address spaces currently in use. I'm not sure if it would be better to use 1/2/3 or some large numbers. https://reviews.llvm.org/D64931 contains the patch. Any feedback is welcome! - Amy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190718/d83babfb/attachment.html>